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Habib-ur Rehmann, Akbar Ali, Chaudhary Jamil Anwar, Shafaat Ahmed

Synergistic extraction of Nd(III), Tb(III) and Lu(III) ions with a mixture of picrolonic acid and benzo-15-crown-5 in chloroform

Keywords: Extraction, Nd3+, Tb3+, Lu3+, Picrolonic acid

The synergistic mixture comprising picrolonic acid (HPA) and benzo-15-crown-5 (B15C5) in chloroform has been used for the extraction of Nd³⁺, Tb³⁺ and Lu³⁺ as representatives of lanthanide(III) ions from pH 1-2 solutions having ionic strength of 0.1 mol l^-1 (K⁺/H⁺, Cl^-). The composition of the extracted species has been determined as M(PA)₃·nB15C5 where M is Nd, Tb and Lu and n = 1 or 2. The acid dissociation constant (pK_a) has been evaluated to be 2.52±0.01. The influence of various anions and cations on the extraction of these lanthanide(III) ions has also been studied and only oxalate and thiosulphate among the anions and Cu²⁺, Fe³⁺, Zn²⁺ and Ni²⁺ among the cations have some deleterious effect. The extraction equilibrium constants have been evaluated and discussed.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 94, 08/2006
Pages: 475 - 480

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